Welcome to Year 3 Mathematics
Lessons & Assignments
WEEK 9 SUBTRACTION
(With Regrouping)
SUBTRACTION WITH REGROUPING
It means to subtract a smaller number from a bigger number WITH BORROWING.
EXAMPLE 1. Subtract 4249 and 1926
Th H T O
4 2 4 9
- 1 9 2 6
12
3
3
2
3
2
EXAMPLE 1. Subtract 4249 and 1926
Th H T O
4 2 4 9
- 1 9 2 6
12
3
3
2
3
2
SUBTRACTION WITH REGROUPING
​
It means to subtract WITH BORROWING.
Th H T O
5 6 7 8
- 1 9 3 7
4
16
3
7
4
1
Step 1 : Subtract the Ones (O)
Step 2 : Subtract the Tens (T)
Step 3 : Look at the Hundreds (H).
6 is SMALLER THAN 9 = you cannot subtract. Borrow 1 from Thousands (Th). Add the 1 to Hundreds. Subtract the Hundreds (H).
Step 4 : Subtract the Thousands (Th).
Regrouping in Hundreds and Thousands
EXAMPLE 1. 8273 - 640 = ?
​
Th H T O
8 2 7 3
- 6 4 0
12
7
3
3
6
7
EXAMPLE 2. Find the difference between 9315 and 3701
Th H T O
9 3 1 5
- 3 7 0 1
13
8
4
1
6
5
EXAMPLE 3. Subtract 4249 and 1926
Th H T O
4 2 4 9
- 1 9 2 6
12
3
3
2
3
2
EXAMPLE 4. 7468 - 2943 = ?
​
Th H T O
7 4 6 8
- 2 9 4 3
14
6
5
2
5
4
Regrouping in Ones, Tens, Hundreds and Thousands
EXAMPLE 1. 3097 - 428 = ?
​
Th H T O
3 0 9 7
- 4 2 8
10
2
17
8
9
6
6
2
EXAMPLE 2. Subtract 4695 and
8319
Th H T O
8 3 1 9
- 4 6 9 5
1
7
11
2
4
6
3
2
EXAMPLE 3. 8045 - 3977 = ?
Th H T O
8 0 4 5
- 3 9 7 7
9
7
15
3
1
8
6
0
4
EXAMPLE 4. Find the difference between 2313 and 1627.
Th H T O
2 3 1 3
- 1 6 2 7
1
1
13
0
1
2
6
8
6
SUBTRACTION WITH REGROUPING
​
It means to subtract WITH BORROWING.
Th H T O
5 6 7 8
- 1 9 3 7
4
16
3
7
4
1
Step 1 : Subtract the Ones (O)
Step 2 : Subtract the Tens (T)
Step 3 : Look at the Hundreds (H).
6 is SMALLER THAN 9 = you cannot subtract. Borrow 1 from Thousands (Th). Add the 1 to Hundreds. Subtract the Hundreds (H).
Step 4 : Subtract the Thousands (Th).
Regrouping in Hundreds and Thousands
Example 1.
8273 - 640 = ?
​
Th H T O
8 2 7 3
- 6 4 0
12
7
3
3
6
7
Example 2.
Find the difference between 9315 and 3701.
Th H T O
9 3 1 5
- 3 7 0 1
13
8
4
1
6
5
Example 3.
Subtract 4249 and 1926.
Th H T O
4 2 4 9
- 1 9 2 6
12
3
3
2
3
2
Example 4.
7468 - 2943 = ?
​
Th H T O
7 4 6 8
- 2 9 4 3
14
6
5
2
5
4
Regrouping in Ones, Tens, Hundreds and Thousands
Example 1.
3097 - 428 = ?
​
Th H T O
3 0 9 7
- 4 2 8
10
2
17
8
9
6
6
2
Example 2.
Subtract 4695 and 8319.
Th H T O
8 3 1 9
- 4 6 9 5
1
7
11
2
4
6
3
2
Example 3.
8045 - 3977 = ?
Th H T O
8 0 4 5
- 3 9 7 7
9
7
15
3
1
8
6
0
4
Example 4.
Find the difference between 2313 and 1627.
Th H T O
2 3 1 3
- 1 6 2 7
1
1
13
0
1
2
6
8
6